@misc{indiciaea64bf5c084bd,
  title = {Shear wave propagation in rocks.},
  author = {N I Christensen},
  year = {1971},
  doi = {10.1038/229549b0},
  url = {https://pubmed.ncbi.nlm.nih.gov/16059346/},
  note = {Source identifier: 16059346}
}